a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb. arm, branch, limb (noun). any projection that is thought to resemble a human arm.
Vertebrates are the most organized organisms on Earth. They belong to the sub-phylum Vertebrata. They are not the most numerous group of animals, they are the most advanced group of animals.The characteristics that makes vertebrates special are the presence of the spinal cords, vertebrae and notochords.hey belong to the Phylum Chordata. The characteristics of phylum chordata is the presence of notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. The members of subphylum Vertebrata possess notochord during the embryonic period.
All vertebrate animals, including humans, have a backbone and an internal skeleton. Our skeleton helps to give us our shape, helps us move, and protects soft body parts. While skeleton shape and structure vary greatly from animal to animal, all vertebrates have a skeleton.Invertebrates do not have vertebrae in them. Some, like lobsters or dragonflies, have an exoskeleton, a hard covering that functions similarly to the skeleton of a vertebrate.Some are shelled, like snails and oysters.ll vertebrate animals, including humans, have a backbone and an internal skeleton. Our skeleton helps to give us our shape, helps us move, and protects soft body parts. While skeleton shape and structure vary greatly from animal to animal, all vertebrates have a skeleton.